I am updating a custom plugin that utilizes the Knowledge Document Type and uses the getInternalFilename() to get the absolute path of the document. That function has been deprecated, what is the preferred replacement, as I still need the absolute path of the document. Would getExternalFilename() return a similar value.
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Find some alternatives here: https://docs.appian.com/suite/help/24.2/api/com/appiancorp/suiteapi/knowledge/Document.html#getInternalFilename()
You can also check other plugins from the app market for the included source code.
A word of caution here. My experience with developing plugins is quite limited.